[N. K. Krupskaia and I. P. Pavlov on the propagation of science. (Unpublished documents)].
D049672:History, 19th Century; D049673:History, 20th Century; D012425:Russia (Pre-1917); D012586:Science / Q000193:education
N. K. Krupskaia i I. P. Pavlov o propagande nauki. (Neopublikovannye dokumenty)